The Spectrum of 3C390.3 and the Hydrogen Line Problem

Details The Spectrum of 3C390.3 and the Hydrogen Line Problem The Spectrum of 3C390.3 and the Hydrogen Line Problem

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..589n&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 198, P. 589, 1982

Astronomy and Astrophysics

Astronomy

59

Scientific paper

Spectroscopic observations of 3C 390.3 from 1979 and 1980 are shown and compared with previous results. The new data show very clearly a double absorption feature near Hβ and Hγ and a very broad He ii λ4686 line. The absorbing material is moving towards us with relative velocities of about 2240 and 1265 km s-1, and the amount of absorption and line variability is best explained by a partial coverage of the background continuum source. The 1979-1980 continuum is much fainter and much steeper than the 1974-1975 one. Critical discussion and reanalysis of the U observations of Ferland et al. shows that the broad component of this line has more than twice the intensity of the narrow component, in contradiction to the 1:1 ratio found before. The "expected" Lα/Hβ ratio in a low-density gas near a non-thermal source is calculated for several cases of interest. The resulting ratio can exceed the case B value by more than a factor of 2. A model for the narrow-line region of 3C 390.3 that fits the observations must include a reddening of AV ≃ 0.5 in order to explain the observed Lα(narrow)/Hα(narrow). In addition Ha and H are affected by self-absorption in the low density gas. The broad-line region, and perhaps the continuum, are reddened by at least the same amount, and Hβ is collisionally enhanced by a factor of 2-4.

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